Oh boy, this has raised worries about my air heating system. When I bought my place, the gas heater was off. I made sure the supply was off at the meter. Eventually, I wanted to start it, and found the photos in the instructions (similar to the above) did not match the reality, and had to get someone in. What he did was disconcerting, involving opening all the doors and venting gas.

Last year I found that running the pilot light through the summer cost about £20, so I want not to do that this year. But now I don't fancy switching off.

I could always get the guy who does the annual check to switch it back on for me, I suppose.

Penny